The heat flux on film-cooled surfaces

Abstract EN

The effect of film cooling on the heat flux to a film-cooled surface is assessed to convey the optimum film cooling conditions for injection geometry of a single row of holes.

The experimental technique em¬ployed uses a swollen polymer surface and laser holographic interfe- rometry.

Two coolant fluids were used, air and carbon dioxide with a density ratio of 1.0 and 1.52, respectively.

The coolant was injected through a row of holes inclined at 35° or 90° to the mainstream direc¬tion.

The heat transfer data obtained and those of other workers are combined and applied to calculations of film-cooled surfaces.

The re¬sults indicated that better film cooling performance may be accom¬plished when coolants are injected at a streamwise angle, with relative¬ly low blowing rates and high density ratios.